Allow square brackets in external issue patterns (#3408)

* Allow square brackets in external issue patterns

* Added false test cases for checklist elements

modules/markup/html.go

@@ -38,9 +38,9 @@ var (
 	MentionPattern = regexp.MustCompile(`(\s|^|\W)@[0-9a-zA-Z-_\.]+`)
 
 	// IssueNumericPattern matches string that references to a numeric issue, e.g. #1287
-	IssueNumericPattern = regexp.MustCompile(`( |^|\()#[0-9]+\b`)
+	IssueNumericPattern = regexp.MustCompile(`( |^|\(|\[)#[0-9]+\b`)
 	// IssueAlphanumericPattern matches string that references to an alphanumeric issue, e.g. ABC-1234
-	IssueAlphanumericPattern = regexp.MustCompile(`( |^|\()[A-Z]{1,10}-[1-9][0-9]*\b`)
+	IssueAlphanumericPattern = regexp.MustCompile(`( |^|\(|\[)[A-Z]{1,10}-[1-9][0-9]*\b`)
 	// CrossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository
 	// e.g. gogits/gogs#12345
 	CrossReferenceIssueNumericPattern = regexp.MustCompile(`( |^)[0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+#[0-9]+\b`)

modules/markup/html_test.go

@@ -345,6 +345,7 @@ func TestRegExp_IssueNumericPattern(t *testing.T) {
 		"#1234",
 		"#0",
 		"#1234567890987654321",
+		"[#1234]",
 	}
 	falseTestCases := []string{
 		"# 1234",
@@ -355,6 +356,8 @@ func TestRegExp_IssueNumericPattern(t *testing.T) {
 		"#1A2B",
 		"",
 		"ABC",
+		"[]",
+		"[x]",
 	}
 
 	for _, testCase := range trueTestCases {
@@ -371,6 +374,7 @@ func TestRegExp_IssueAlphanumericPattern(t *testing.T) {
 		"A-1",
 		"RC-80",
 		"ABCDEFGHIJ-1234567890987654321234567890",
+		"[JIRA-134]",
 	}
 	falseTestCases := []string{
 		"RC-08",
@@ -383,6 +387,7 @@ func TestRegExp_IssueAlphanumericPattern(t *testing.T) {
 		"ABC",
 		"GG-",
 		"rm-1",
+		"[]",
 	}
 
 	for _, testCase := range trueTestCases {